The　decoupling　characteristics　of　multi-electrode　arc　heat　and　mass　provide　a　reliable　approach　for　achieving　efficient　and　high-quality　welding　and　additive　manufacturing.　However,　the　presence　of　polar　effect　reduces　the　stability　of　the　main　arc,　limiting　its　application.　To　address　this　issue,　this　paper　proposes　the　skew-coupling　arc　(SCA)　and　conducts　in-depth　research　on　the　mass　transfer　(MT)　mechanism.　The　paper　conducts　comparative　experiments　to　evaluate　the　MT　capacity　(MTC)　of　the　inter-wire　arc　(IWA)　and　analyzes　how　characteristic　parameters　of　the　SCA　influence　the　MT　performance　of　the　IWA.　The　results　indicate　that　the　MTC　primarily　depends　on　the　heat　generated　by　the　IWA　itself.　Compared　to　situation　without　the　IWA,　the　deposition　speed　can　reach　15.9　m/min　with　a　growth　rate　of　356　%　at　an　input　voltage　of　30　V.　The　IWA　current　is　linearly　related　to　the　input　voltage,　with　a　growth　rate　of　13.3　A/V.　At　the　same　current,　the　MTC　of　the　IWA　is　three　times　greater　than　that　of　the　direct　current　gas　metal　arc,　and　can　reach　21　m/min　at　a　current　of　280　A.　Notably,　a　segment　of　molten　liquid　is　suspended　at　the　end　of　the　cathode　wire,　with　its　behavior　intimately　linked　to　the　transition　dynamics　of　cathode　droplets.　The　input　voltage　varies　from　21　V　to　27　V,　and　the　temperature　of　the　suspension　liquid　increases,　resulting　in　a　decrease　in　surface　tension　and　a　significant　reduction　in　size　from　4.6　mm　to　1.9　mm.　Raising　the　input　voltage　can　significantly　enhance　the　MTC　of　the　IWA　and　promote　anode　droplet　transfer,　but　the　spot　force　at　the　base　of　the　cathode　droplet　leads　to　an　excessive　increase　in　droplet　size,　hindering　effective　transfer.　The　cathode　droplet　size　reaches　3.9　mm　at　an　input　voltage　of　30　V.　By　adjusting　the　plasma　arc　current　and　plasma　gas　flow　rate　to　regulate　the　plasma　fluid　force　acting　on　the　cathode　droplets,　the　adverse　effects　of　the　spot　force　can　be　mitigated,　thereby　facilitating　the　droplet　transfer　process　and　simultaneously　improving　weld　formation　quality.　These　findings　are　expected　to　establish　a　theoretical　basis　for　the　MT　and　provide　methodological　guidance　for　the　practical　application　of　SCA　heat　sources.　©　2025　The　Society　of　Manufacturing　Engineers